A Monte Carlo test for the identifying assumptions of the Blanchard and Quah (1989) model
In their VAR model, Blanchard and Quah (BQ, 1989) employed uncorrelatedness between Aggregate Supply (AS) and Aggregate Demand (AD) shocks and the long-run output neutrality condition as identifying assumptions. This article conducts a simple Monte Carlo experiment to gauge how well the BQ procedure can approximate the true structure if the underlying assumptions of uncorrelatedness and long-run output neutrality are not supported by data.